medusalocker | 34601e5edf184f46c37314559e0a361cbce3aadc451e09f8b84020232fa710ad

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2024 13:15

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General

Target

rb.exe
Size

669KB
MD5

ae286ff258c5ec1d15a4fd3f64875d5b
SHA1

576b9e76e385b389f859ee4bde2d12776bbaedca
SHA256

ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769
SHA512

f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b
SSDEEP

12288:dQA0FfTcwpBuV2UxqDmuiLZeUaoFi2XZWfGe615HhAZV8DiKD/KeX:Tuf4wTuV2Ux3uIZeUBi2Te6HWnKrKe

Score

10^/10

medusalocker discovery evasion ransomware spyware stealer trojan

Malware Config

Extracted

Path

\Device\HarddiskVolume1\HOW_TO_RECOVER_DATA.html

Ransom Note

<html> <style type="text/css"> body { background-color: #f5f5f5; } h1, h3{ text-align: center; text-transform: uppercase; font-weight: normal; } /*---*/ .tabs1{ display: block; margin: auto; } .tabs1 .head{ text-align: center; float: top; padding: 0px; text-transform: uppercase; font-weight: normal; display: block; background: #81bef7; color: #DF0101; font-size: 30px; } .tabs1 .identi { font-size: 10px; text-align: center; float: top; padding: 15px; display: block; background: #81bef7; color: #DFDFDF; } .tabs .content { background: #f5f5f5; /*text-align: center;*/ color: #000000; padding: 25px 15px; font-size: 15px; font-weight: 400; line-height: 20px; } .tabs .content a { color: #df0130; font-size: 23px; font-style: italic; text-decoration: none; line-height: 35px; } .tabs .content .text{ padding: 25px; line-height: 1.2; } </style> <body> <div class="tabs1"> <div class="head" ><b>Your personal ID:</b></div> <div class="identi"> <span style="width:1000px; color: #ffffff; font-size: 10px;">118281505A0CD820B7D651C73218F1BED5E5B1CA8F057B8C71129A679C940CF4704C803345BEBA06767B56EB2A5E03463CD0D9A9F8868827C3424277D2E57244<br>379D8DAAAC7729678D6432C2543C5A53CDBABB59D62C271CD30CAD30F5ECC01AC648E5AB6058878F099849E02694917AD2A070523A5ED92BFF8E3749CFF4<br>C7AF0758C4CDC7599D62B47771AC28F1AA1F9AEC8C3EBD7192A5A2AFA0FC1EE95D2758B61C186BA9A2E2F24D10DB3CCE6C1FD9CC8CB68993BF0EC9F3385D<br>366699CEABFFAB38AE9C54700AEC8C11D432C5A73A2E8425C9960BA328D4585E47066CA602BED0628657AF58745536CA80B9DF4C80DD3EA8A7BF3CBA60DD<br>41BF6074C7A5923520E33A1F7E779B11E1482445D1F6FAF6FD943ACAC9CF4D3AAB85FA34A96E1D27B3EE1A60BD12BBA2C9586DEE3474933D1FDA392C37EB<br>76AE7B1566C459E8699BE456035F839F73D0F91840BCBFDCE01F17113A2409EA9401A9F8F40A077FD302EDAF9CFF9B1305B8159016CE0F2DC054C58DC566<br>71970A2868744C8E328F6135CBA6EC9F61FD4A426FCC36E0D9D3CC4C78BBCF9EAF00AD6EC9A81204B4BBEC6F326635345AB6E0CED2998583B33396218B78<br>16EB2EB048D10F2A26C0859D0CCFD1DBA585AF0F1495183BB945910F376051C809A0ED8DDA518A0A3D09B078074DFB6666FD9A0CC21AB6A5CBC6D03E360B<br>EDF0B299851CC7A2B798BB107325</span> <br>  </div> </div>  <div class="tabs">  <div class="tab"> <div id="tab-content1" class="content"> <div class="text">  <b>/!\ YOUR COMPANY NETWORK HAS BEEN PENETRATED /!\</b><br> <b>All your important files have been encrypted!</b><br><br> <hr> Your files are safe! Only modified. (RSA+AES)<br><br> ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE<br> WILL PERMANENTLY CORRUPT IT.<br> DO NOT MODIFY ENCRYPTED FILES.<br> DO NOT RENAME ENCRYPTED FILES.<br><br> No software available on internet can help you. We are the only ones able to<br> solve your problem.<br><br> We gathered highly confidential/personal data. These data are currently stored on<br> a private server. This server will be immediately destroyed after your payment.<br> If you decide to not pay, we will release your data to public or re-seller.<br> So you can expect your data to be publicly available in the near future..<br><br> We only seek money and our goal is not to damage your reputation or prevent<br> your business from running.<br><br> You will can send us 2-3 non-important files and we will decrypt it for free<br> to prove we are able to give your files back.<br><br>  <hr> <b>Contact us for price and get decryption software.</b><br><br> <a>.onion</a><br> * Note that this server is available via Tor browser only<br><br> Follow the instructions to open the link:<br> 1. Type the addres "https://www.torproject.org" in your Internet browser. It opens the Tor site.<br> 2. Press "Download Tor", then press "Download Tor Browser Bundle", install and run it.<br> 3. Now you have Tor browser. In the Tor Browser open <a>qd7pcafncosqfqu3ha6fcx4h6sr7tzwagzpcdcnytiw3b6varaeqv5yd.onion </a><br> 4. Start a chat and follow the further instructions. <br><br> <hr> <b>If you can not use the above link, use the email:</b><br> <a href="[email protected] ">[email protected] </a> <br><a href="[email protected]">[email protected]</a> <br> <b>* To contact us, create a new free email account on the site:</b> <a href="https://protonmail.com">protonmail.com<br> <hr> <b> IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.</b><br> </div> </div> </div>   </div> </div>  </div> </div> </body> </html>

Emails

href="[email protected]

">[email protected]

href="[email protected]">[email protected]</a>

Signatures

MedusaLocker
Ransomware with several variants first seen in September 2019.
ransomware medusalocker

MedusaLocker payload 1 IoCs

resource	yara_rule
behavioral8/files/0x000c000000023b07-593.dat	family_medusalocker

Medusalocker family
medusalocker

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	rb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	rb.exe

Renames multiple (190) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Executes dropped EXE 1 IoCs

pid	Process
2424	svhost.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	rb.exe

Drops desktop.ini file(s) 1 IoCs

description	ioc	Process
File opened for modification	\??\Z:\$RECYCLE.BIN\S-1-5-21-1045960512-3948844814-3059691613-1000\desktop.ini	rb.exe

Enumerates connected drives 3 TTPs 24 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\Y:	rb.exe
File opened (read-only)	\??\Z:	rb.exe
File opened (read-only)	\??\G:	rb.exe
File opened (read-only)	\??\H:	rb.exe
File opened (read-only)	\??\I:	rb.exe
File opened (read-only)	\??\K:	rb.exe
File opened (read-only)	\??\Q:	rb.exe
File opened (read-only)	\??\X:	rb.exe
File opened (read-only)	\??\F:	rb.exe
File opened (read-only)	\??\J:	rb.exe
File opened (read-only)	\??\O:	rb.exe
File opened (read-only)	\??\P:	rb.exe
File opened (read-only)	\??\S:	rb.exe
File opened (read-only)	\??\W:	rb.exe
File opened (read-only)	\??\V:	rb.exe
File opened (read-only)	\??\A:	rb.exe
File opened (read-only)	\??\B:	rb.exe
File opened (read-only)	\??\L:	rb.exe
File opened (read-only)	\??\R:	rb.exe
File opened (read-only)	\??\T:	rb.exe
File opened (read-only)	\??\U:	rb.exe
File opened (read-only)	\??\E:	rb.exe
File opened (read-only)	\??\M:	rb.exe
File opened (read-only)	\??\N:	rb.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rb.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svhost.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe
4496	rb.exe

Suspicious use of AdjustPrivilegeToken 63 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1372	wmic.exe
Token: SeSecurityPrivilege	1372	wmic.exe
Token: SeTakeOwnershipPrivilege	1372	wmic.exe
Token: SeLoadDriverPrivilege	1372	wmic.exe
Token: SeSystemProfilePrivilege	1372	wmic.exe
Token: SeSystemtimePrivilege	1372	wmic.exe
Token: SeProfSingleProcessPrivilege	1372	wmic.exe
Token: SeIncBasePriorityPrivilege	1372	wmic.exe
Token: SeCreatePagefilePrivilege	1372	wmic.exe
Token: SeBackupPrivilege	1372	wmic.exe
Token: SeRestorePrivilege	1372	wmic.exe
Token: SeShutdownPrivilege	1372	wmic.exe
Token: SeDebugPrivilege	1372	wmic.exe
Token: SeSystemEnvironmentPrivilege	1372	wmic.exe
Token: SeRemoteShutdownPrivilege	1372	wmic.exe
Token: SeUndockPrivilege	1372	wmic.exe
Token: SeManageVolumePrivilege	1372	wmic.exe
Token: 33	1372	wmic.exe
Token: 34	1372	wmic.exe
Token: 35	1372	wmic.exe
Token: 36	1372	wmic.exe
Token: SeIncreaseQuotaPrivilege	4368	wmic.exe
Token: SeSecurityPrivilege	4368	wmic.exe
Token: SeTakeOwnershipPrivilege	4368	wmic.exe
Token: SeLoadDriverPrivilege	4368	wmic.exe
Token: SeSystemProfilePrivilege	4368	wmic.exe
Token: SeSystemtimePrivilege	4368	wmic.exe
Token: SeProfSingleProcessPrivilege	4368	wmic.exe
Token: SeIncBasePriorityPrivilege	4368	wmic.exe
Token: SeCreatePagefilePrivilege	4368	wmic.exe
Token: SeBackupPrivilege	4368	wmic.exe
Token: SeRestorePrivilege	4368	wmic.exe
Token: SeShutdownPrivilege	4368	wmic.exe
Token: SeDebugPrivilege	4368	wmic.exe
Token: SeSystemEnvironmentPrivilege	4368	wmic.exe
Token: SeRemoteShutdownPrivilege	4368	wmic.exe
Token: SeUndockPrivilege	4368	wmic.exe
Token: SeManageVolumePrivilege	4368	wmic.exe
Token: 33	4368	wmic.exe
Token: 34	4368	wmic.exe
Token: 35	4368	wmic.exe
Token: 36	4368	wmic.exe
Token: SeIncreaseQuotaPrivilege	4732	wmic.exe
Token: SeSecurityPrivilege	4732	wmic.exe
Token: SeTakeOwnershipPrivilege	4732	wmic.exe
Token: SeLoadDriverPrivilege	4732	wmic.exe
Token: SeSystemProfilePrivilege	4732	wmic.exe
Token: SeSystemtimePrivilege	4732	wmic.exe
Token: SeProfSingleProcessPrivilege	4732	wmic.exe
Token: SeIncBasePriorityPrivilege	4732	wmic.exe
Token: SeCreatePagefilePrivilege	4732	wmic.exe
Token: SeBackupPrivilege	4732	wmic.exe
Token: SeRestorePrivilege	4732	wmic.exe
Token: SeShutdownPrivilege	4732	wmic.exe
Token: SeDebugPrivilege	4732	wmic.exe
Token: SeSystemEnvironmentPrivilege	4732	wmic.exe
Token: SeRemoteShutdownPrivilege	4732	wmic.exe
Token: SeUndockPrivilege	4732	wmic.exe
Token: SeManageVolumePrivilege	4732	wmic.exe
Token: 33	4732	wmic.exe
Token: 34	4732	wmic.exe
Token: 35	4732	wmic.exe
Token: 36	4732	wmic.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 1372	4496	rb.exe	84
PID 4496 wrote to memory of 1372	4496	rb.exe	84
PID 4496 wrote to memory of 1372	4496	rb.exe	84
PID 4496 wrote to memory of 4368	4496	rb.exe	87
PID 4496 wrote to memory of 4368	4496	rb.exe	87
PID 4496 wrote to memory of 4368	4496	rb.exe	87
PID 4496 wrote to memory of 4732	4496	rb.exe	89
PID 4496 wrote to memory of 4732	4496	rb.exe	89
PID 4496 wrote to memory of 4732	4496	rb.exe	89

System policy modification 1 TTPs 3 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	rb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	rb.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLinkedConnections = "1"	rb.exe

C:\Users\Admin\AppData\Local\Temp\rb.exe
"C:\Users\Admin\AppData\Local\Temp\rb.exe"
1⤵
- UAC bypass
- Checks whether UAC is enabled
- Drops desktop.ini file(s)
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4496
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:1372
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4368
- C:\Windows\SysWOW64\Wbem\wmic.exe
  wmic.exe SHADOWCOPY /nointeractive
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  PID:4732

C:\Users\Admin\AppData\Roaming\svhost.exe
C:\Users\Admin\AppData\Roaming\svhost.exe
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
PID:2424

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\svhost.exe

Filesize
669KB

MD5
ae286ff258c5ec1d15a4fd3f64875d5b

SHA1
576b9e76e385b389f859ee4bde2d12776bbaedca

SHA256
ce0facb2c24c71a20117e27af3aed9d6815500eeadba6e79b472bef539d82769

SHA512
f2cf299e20571701ab7a7ad82103317279e8378f114e3de76b22580eb5e8263a025af1fb653b27323645e0ac63983dcbf6f609154a16e8e9d6c81531c369183b

Download Submit
C:\Users\Default\ntuser.dat.LOG2

Filesize
536B

MD5
d5f24532e4368a8bbb28d98721629a66

SHA1
3c013bef72fd3b125af8e32a7932b605ee49da9e

SHA256
a9824b3f8650d33df863a3565f46c24ce950674a6ea5bbd972d88d062e69d1c0

SHA512
407bd803d254887c9ae56c8f5d2a3ad9bfc4c72d149af7277c7d3be20dd23ecea53c8c817871f9c9fb273c78a197e4e4b4014dc533a985b1a8609d37258df81b

Download Submit
\Device\HarddiskVolume1\HOW_TO_RECOVER_DATA.html

Filesize
5KB

MD5
7321b09180076ae68af78fec2ff00d77

SHA1
48fac87d9ae820e99f1dc8e08b25d8455dcd87fa

SHA256
50d9a45212191a9607ab40c4b0a9727ca5847508ae063e2774b7d3a02b9e7196

SHA512
e37cdec5231122ce4b96913591696f18d14b4f3e3f8763c5742fca6962e18ebcebf855fe231db354adaf3b2bb5c4eb9f012ea86fcdda8ae2f41933d84bf0390e

Download Submit